CHECK INPUT VOLTAGE OF ECM.

1) Connect the connectors to ECM and main relay.

2) Turn the ignition switch to ON.

3) Measure the voltage between ECM connector and chassis ground.

Connector & terminal

(B136) No. 23 (+) — Chassis ground (−):

QUESTION

Is the voltage 10 V or more?

Yes No

Repair the open or ground short circuit of harness between ECM connector and main relay connector.